PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA (PPGEE)
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Banca de QUALIFICAÇÃO: PEDRO AQUINO DE ALCÂNTARA
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: PEDRO AQUINO DE ALCÂNTARA
DATA: 08/08/2022
HORA: 08:30
LOCAL: Videoconferência
TÍTULO: PERFORMANCE ANALYSIS OF PHOTOVOLTAIC/BATTERY-BASEDISLANDED MICROGRID REGULATION
UNDER UNBALANCED CONDITIONS
PALAVRAS-CHAVES: Islanded Microgrid. Photovoltaic-Battery unit. Grid-Forming Control. Droop
Control. Unbalanced load.
PÁGINAS: 69
RESUMO: The huge development of distributed generation (DG) systems and its insertion in main
grid, made the concept of microgrids (MG) target of many literature works and researches.
Most of DG units of MG are formed by renewable energy sources (RES), such as wind and
solar photovoltaic (PV) systems. This kind of electrical generators have been widely studied
and developed in order to replace non-clean energy sources. However, it has been quite a
challenge to make possible MG operation when it is not connected to the main grid. Many
problems have been faced, ranging from voltage and frequency deviations, power sharing
between units and load unbalances. This work studies a three-phase PV/battery-based
MG operating mainly in islanded mode, perform control strategies in power/load sharing,
and analyse MG behavior under several load unbalances. For this, many control strategies
has been implemented in order to overcome several problems. First, it is important to
note that once MG is formed only by PV generators, no rotational inertia is provided
to MG, making it lose frequency reference. Therefore, droop control method attached to
Proportional-Resonant (PR) loops has been implemented aiming to simulate synchronous
generators behavior through a grid-forming control strategy. Furthermore, Battery Energy
Storage Systems (BESS) has been attached to DG units to provide power support due
to its fast response to MG needs. Thus, a power sharing strategy aims to provide MG
power balance through a decentralized method taking in consideration several operation
scenarios. When power required by load is lower than power provided by PV units, BESS
absorbs the surplus power to keep MG balance, once its power and state-of-charge limits
are respected. However, once BESS limits are achieved, it operates in with a current limit
control or it is disconnected from the system, so PV units perform generation curtailment.
On the other hand, once load power is larger than PV power, BESS operates in discharging
mode to compensate power lack, again, until its limits are achieved. Partial results were
obtained from a reduced MG structure used to analyze system behavior under several
levels of load unbalance. It was observed that for a high load scenario, unbalance degrees
above 40% makes MG not to work properly, since DC-link voltage drops and, consequently,
the power delivered to load. In addition, for a low load scenario, 20% of load unbalance
is enough to make BESS, working not properly, discharging instead charging. The work
modelling has been performed using Matlab/Simulink environment.
MEMBROS DA BANCA:
Presidente - 1652514 - CAMILA MARA VITAL BARROS
Interno - 1636976 - FABIANO SALVADORI
Externo ao Programa - 1597497 - LUCIANO SALES BARROS
Externo à Instituição - FLÁVIO BEZERRA COSTA